Figure 2
From: Sample size and power considerations in network meta-analysis
The sources and strength of direct and indirect evidence (by crude sample size) for the four comparisons of newer treatments versus low-dose NRT. The thickened solid lines indicate the direct evidence for the comparison of interest. The thickened dashed lines indicate the indirect evidence that adds to the total effective sample size. The thickened dot-dashed lines indicate a (sparse) source of indirect evidence that can be ignored.